Hello and welcome to justanswer.com my name is XXXXX XXXXX I'm here to help you with your networking question.
I'm in South Africa & about to go to bed but wanted to try to help you get things working.
Firstly, please use those stickers that you mention and put your equipment back into the 192.168.0.xxx IP address range with a subnet mask 255.255.255.0 and gateway of 0.0.0.0
You can put the D-link back to 192.168.0.250.
Please set computer 1 to 192.168.0.2; computer 2 to 192.168.0.3 etc
Once all of the equipment is in the same subnet, they should be able to ping and see each other.
The 169 IP address that you mention is what happens when a computer is set to DHCP and can't get an IP address from a DHCP server. You therefore have to choose a static IPv4 address for each piece of equipment and manually set the IP address. You can also untick the IPv6 option as you won't be setting that up. You are only dealing with IPv4 addresses.
Once things are working, you can set up one computer to share an Internet connection to the other computers by following this procedure
Finally, once all the IP addresses are configured, please shut everything down and then plug things in one by one. Firstly plug in the switch and wait for one minute. Then plug in the printer server. Then boot up computer 1 and wait for one minute. Then do computer 2 followed by 3 etc. Now try printing.
I'll log in when I wake up and hopefully you'll have good news!